Nir Soffer <nir...@gmail.com> added the comment:

Does this really affect only python 3.7?

We see this in RHEL 8.2, using python 3.6.8:
https://bugzilla.redhat.com/show_bug.cgi?id=1837199#c69

Likely caused by:

    lvs = dict(self._lvs)

Without locking. self._lvs is a dict that may contain 1000's of items.

I'm not sure if this is relvant now for upstream, but backport to 3.6 would be 
useful.

----------
nosy: +nirs

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<https://bugs.python.org/issue40327>
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